Dear {client};

We hope that everything is going well for you and that you are enjoying the products that we provided.

However, it has been two months now since we have received a payment and we are wondering if there is some sort of problem we can help you with.  Have you already put a check in the mail to us in the amount of {$.00} for invoice # {0000}?

If not, please give this matter your attention today, since we want to be able to extend you credit the next time you shop with us.

Of course, if there is some sort of problem, know that you can contact us at {phone number} or {email} so we can help.

Sincerely,
{Your Name}
{Your Title}

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